4arm-PEG-SC (4arm-PEG-Succinimidyl Carbonate), MW 2K is an amine-reactive branched PEG polymer, and succinimidyl carbonate derivatives can be cross-linked into PEG hydrogels.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.